Add or update your race or running event
Link to your race page
If you added your event last year just change the date, you can just search for it (or use track tab on your account page) and edit it using the edit tab. You don't have to type it all over again, just make the changes you need and save it, The oldest ones will rank higher in Google, so it pays to update it every year instead of creating a new one. All content is reviewed by human editors so it may not be seen by the public right away.